How to generate openAPI code using multiple yaml file

Question

I have two yaml file, customer.yaml and employee.yaml. How do I generate java code from these two yaml file in single project. I'm using gradle, I know the task specification for single yaml but how do I specify multiple yaml. Should I specify mutiple inputSpec under single openApiGenerator ? if yes then what is the exact syntax to do so. Below is my openApiGenerator task in build.gradle file.

``
openApiGenerate {
    generatorName = "spring"
    apiPackage = "com.xxx.generated.controller"
    modelPackage = "com.xxx.generated.model"
    inputSpec = "$rootDir//schema/employee.yaml".toString()
    outputDir = "$rootDir/generated".toString()
    configOptions = [
        dateLibrary: "java8"
    ]
    systemProperties = [
        invoker : "false", 
        generateSupportingFiles: "true"
    ]
    additionalProperties = [
        interfaceOnly : "true",
    ]
}
 ``

I heard of openApiGenerators task which Lists generators available via Open API Generators but couldn't find a way to use it.

Answer 1

I succeeded in creating dynamically the tasks for each of the yaml files you have in your project. I'm using gradle 4.8.1 but I think that applies to next versions too.

import groovy.io.FileType
import org.openapitools.generator.gradle.plugin.tasks.GenerateTask

plugins {
    id "org.openapi.generator" version "4.1.3"
}

//here we are going to store swagger files
def swaggerList = []

//iteration by swagger file root folder and save into swaggerList variable
def dir = new File("$rootDir/src/main/resources/api/".toString())
dir.eachFileRecurse(FileType.FILES) { file ->
    if (file.getName().endsWith(".yaml"))
        swaggerList << file
}

// Iterate on all swagger files and generate a task for each one with the nomenclature openApiGenerate + swagger name
swaggerList.each {
    println it.path
    def apiName = it.getName().replace(".yaml", "");

    tasks.create("openApiGenerate" + apiName.capitalize(), GenerateTask.class, {
        generatorName = "jaxrs-spec"
        inputSpec = "$rootDir/src/main/resources/api/".toString() + "${apiName}.yaml"
        outputDir = "$buildDir/generated/openapi".toString()
        apiPackage = "my.package.rest.api.definition.".toString() + "${apiName}"
        modelPackage = "my.package.rest.api.model.".toString() + "${apiName}"
        templateDir = "$rootDir/src/main/resources/api/templates".toString()
        //    https://github.com/OpenAPITools/openapi-generator/blob/master/docs/generators/jaxrs-spec.md
        configOptions = [
                dateLibrary: "java8",
                java8: true,
                useBeanValidation: true,
                interfaceOnly: true,
                useOptional: true,
                useLombok: true
        ]
    })
}

sourceSets {
    main {
        java {
            srcDir("$buildDir/generated/openapi/src/gen/java")
            srcDir("$buildDir/generated/openapi/src/main/java")
        }
    }
}

After this if I have a swagger file named login.yaml and other named user.yaml user.yaml I call next gradle tasks:

gradle openApiGenerateLogin

Or

gradle openApiGenerateUser

Answer 2

Added following code in build.gradle and I was able to generate the java code. Copy the spec1 & spec2 yaml file under schema folder. Additionally, you need to have openApi plugin and dependencies configured in build.gradle.

task buildPaymentClient(type: org.openapitools.generator.gradle.plugin.tasks.GenerateTask){
generatorName = "spring"
inputSpec = "$rootDir//schema/spec1.yaml".toString()
outputDir = "$rootDir/generated".toString()
apiPackage = "com.abc.code.generated.controller"
modelPackage = "com.abc.code.generated.model"
configOptions = [
        dateLibrary: "java8"
]
systemProperties = [
    invoker : "false", 
    generateSupportingFiles: "true"
]
additionalProperties = [
    interfaceOnly : "true",
]

}

openApiGenerate {
    generatorName = "spring"
    apiPackage = "com.abc.code.generated.controller"
    modelPackage = "com.abc.code.generated.model"
    inputSpec = "$rootDir//schema/spec2.yaml".toString()
    outputDir = "$rootDir/generated".toString()
    configOptions = [
        dateLibrary: "java8"
    ]
    systemProperties = [
        invoker : "false", 
        generateSupportingFiles: "true"
    ]
    additionalProperties = [
        interfaceOnly : "true",
    ]
}

compileJava.dependsOn buildPaymentClient, tasks.openApiGenerate